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        // keep-alive可以实现组件缓存，当组件切换时不会对当前
        // 组件进行卸载。常用的两个属性 include和exclude，允许组件有条件的进行缓存
        // 两个生命周期：activated/deactivated,用来得知当前组件是否处于活跃状态

        
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